AcDbGripData::setAppData(void * appData)

Acad::ErrorStatus ExtCircle::getGripPoints (
        AcDbGripDataPtrArray &grips, const double curViewUnitSize, const int gripSize, 
        const AcGeVector3d &curViewDir, const int bitflags) const 
{
        assertReadEnabled () ;
  AcDbGripData *pGrpCenter = new AcDbGripData();
  pGrpCenter->setGripPoint(this->center());
  pGrpCenter->setAppData((void*)new MyAppData(100)); 
  grips.append(pGrpCenter);
  double ang = 0.0;
  for(int idx = 1 ; idx center();
    p.x += this->radius() *cos(ang);
    p.y += this->radius() *sin(ang);
    ang += 6.28318531 / 32;
    pGrp->setGripPoint(p);
    // give the AcDbGripData a ptr
    pGrp->setAppData((void*)_data);
    pGrp->setAlternateBasePoint(new  AcGePoint3d(this->center()));
    grips.append(pGrp);
    // keep a copy of ptr to free later
    ptrs->push_back(_data);
  }
  return Acad::eOk;
}

Acad::ErrorStatus ExtCircle::moveGripPointsAt (
        const AcDbVoidPtrArray &gripAppData, const AcGeVector3d &offset,
        const int bitflags) {
    assertWriteEnabled();
    for(int i = 0; i Val())
      {
      case 100:
          transformBy(AcGeMatrix3d::translation(offset));
        break;
      default:
        this->setRadius(offset.length());
      }
      // run a method from the class
      p->printval();
    }
    return Acad::eOk;
}